Lennox International Inc O23V3-105, O23V5-140 Equipment in Confined Space All Air From Outside

Equipment in Confined Space

All Air From Outside

OR_ _ OIL VENT

_WATER

IIII IIIIHEATER

IIII OILFURNACE

INLET AIR

NOTE - Each air duct opening shall have a free area of at least one square inch (6A square centimeters) per 2,000 Btu (586 W) per hour of the total input rating of all equipment in the enclosure. If the equipment room is located against an outside wall and the air openings communicate directly with the outdoors, each opening shall have a free area of at least one square inch (6.4 square centimeters) per 4,000 Btu (1172 W) per hour of the total input rating of all other equipment in the enclosure.

Figure 12

When ducts are used, they shall be of the same cross-sec- tional area as the free area of the openings to which they connect, The minimum dimension of rectangular air ducts shall be no less than 3" (76 mm), In calculating free area, the blocking effect of louvers, grilles, or screens must be considered. If the design and free area of protective cover- ing is not known for calculating the size opening required, it may be assumed that wood louvers will have 20 to 25% free area and metal louvers and grilles will have 60 to 75% free area, Louvers and grilles must be fixed in the open position or interlocked with the equipment so that they are opened automatically during equipment operation,

Direct Connection of Outdoor Air for Combus- tion

The Beckett AFII burner was designed to allow for direct air intake piping (4" [102 mm]), The maximum equivalent length of pipe is 70 feet (21.3 m). A 90 ° elbow equals 6feet (1.8 m). The enclosed intake pipe ring may be used

to facilitate direct air intake to the burner through the right side of the cabinet,

To convert the AFII burner from confined space to outside combustion air, simply remove the three screws attaching the inlet air scoop to the burner and insert 4" (102 mm) di- rect air intake piping.

The use of a barometric relief placed in the intake pipe is recommended when outdoor combustion air is directly connected to the burner. This will allow confined space air to be used as combustion air in the event that the opening to the outdoor air becomes blocked. Using a barometric re- lief in the intake will reduce the chance of sooting.

CAUTION

Removal of Unit from Common Venting System

In the event that an existing furnace is removed from a venting system commonly run with separate appliances, the venting system is likely to be too large to properly vent the remaining attached appliances. The following test should be conducted while each appliance is in operation and the other appliances not in operation remain con- nected to the common venting system. If venting system has been installed improperly, the system must be cor- rected as outlined in the previous section.

1.Seal any unused openings in the common venting sys- tem.

2.Visually inspect venting system for proper size and horizontal pitch and determine there is no blockage or restriction, leakage, corrosion or other deficiencies which could cause an unsafe condition.

3.Insofar as is practical, close all building doors and win- dows and all doors between the space in which the ap- pliances remaining connected to the common venting system are located and other spaces of the building.

Turn on clothes dryers and any appliances not con- nected to the common venting system. Turn on any

exhaust fans, such as range hoods and bathroom ex- hausts, so they will operate at maximum speed. Do not operate a summer exhaust fan. Close fireplace damp- ers.

4.Following the lighting instruction on the unit, place the appliance being inspected in operation. Adjust ther- mostat so appliance will operate continuously.

5.Test for spillage using a draft gauge.

6.After it has been determined that each appliance re- maining connected to the common venting system properly vents when tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and

any other fuel burning appliance to their previous con- dition of use.

7.If improper venting is observed during any of the above tests, the common venting system must be cor- rected.

Horizontal Venting

The O23V is approved for horizontal venting with the fol- lowing mechanical vent systems:

•Tjernlund (sideshot) #SSlC

•Field Controls #SWG-5 with the CK-61 control kit Refer to the manufacturers' installation instructions for installation procedures and service parts information.

Do not use the same vent with any other appliance when using a sidewall vent system.

Maximum permissible vent length is 70 equivalent feet. Minimum length is 15 equivalent feet. Calculate the equiv- alent vent pipe footage from the furnace to the mechanical vent system (Tjernlund or Field Controls) by adding the straight vent pipe length and the equivalent elbow lengths together.

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O23V SERIES